[bug] git add -p breaks, if color.ui is set to "always"

After an update to version 2.14.2 from 2.14.1 "git add --patch" stopped working
for me, just producing the same output as "git diff", but not prompting to stage
anything.
I found that unsetting the config key color.ui, which was set to "always" fixed
the problem.
>From the manpage, color.ui should not have that effect and "always" should be a
legal value.
Regards
Alexander Gehrke